Installing the PowerConnect Device 41Table 3-4. Ports, Connectors and CablesThe RJ-45pin number allocation for the 10/100/1000BaseT ports is listed in the table following.Table 3-5. RJ-45 Pin Number Allocation for 10/100/1000BaseT Ethernet PortPort Default SettingsThe general information for configuring the device ports includes the short description of the auto-negotiation mechanism and the default settings for switching ports.Auto-NegotiationAuto-negotiation enables automatic detection of speed, duplex mode and flow control onswitching 10/100/1000BaseT ports. Auto-negotiation is enabled per port by default.Auto-negotiation is a mechanism established between two link partners to enable a port toadvertise its transmission rate, duplex mode and flow control (the flow control by default isdisabled) abilities to its partner. The ports then both operate at the highest common denominatorbetween them.If connecting a NIC that does not support auto-negotiation or is not set to auto-negotiation, boththe device switching port and the NIC must be manually set to the same speed and duplex mode.If the station on the other side of the link attempts to auto-negotiate with a device10/100/1000BaseT port that is configured to full duplex, the auto-negotiation results in the stationattempting to operate in half duplex.Connector Port/Interface CableRJ-45 10/100/1000BaseT Port Cat.5Pin No Function1 TxRx 1+2 TxRx 1-3 TxRx 2+4 TxRx 2-5 TxRx 3+6 TxRx 3-7 TxRx 4+8 TxRx 4-
